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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server.wifi.scanner;
import android.net.wifi.WifiScanner;
import android.util.ArraySet;
import com.android.server.wifi.WifiNative;
import java.util.Set;
/**
* ChannelHelper that offers channel manipulation utilities when the channels in a band are not
* known. Operations performed may simplify any band to include all channels.
*/
public class NoBandChannelHelper extends ChannelHelper {
/**
* These parameters are used to estimate the scan duration.
* This is a guess at the number of channels the device supports for use when a ScanSettings
* specifies a band instead of a list of channels.
*/
private static final int ALL_BAND_CHANNEL_COUNT_ESTIMATE = 36;
@Override
public boolean settingsContainChannel(WifiScanner.ScanSettings settings, int channel) {
if (settings.band == WifiScanner.WIFI_BAND_UNSPECIFIED) {
for (int i = 0; i < settings.channels.length; ++i) {
if (settings.channels[i].frequency == channel) {
return true;
}
}
return false;
} else {
return true;
}
}
@Override
public WifiScanner.ChannelSpec[] getAvailableScanChannels(int band) {
return NO_CHANNELS; // not supported
}
@Override
public int estimateScanDuration(WifiScanner.ScanSettings settings) {
if (settings.band == WifiScanner.WIFI_BAND_UNSPECIFIED) {
return settings.channels.length * SCAN_PERIOD_PER_CHANNEL_MS;
} else {
return ALL_BAND_CHANNEL_COUNT_ESTIMATE * SCAN_PERIOD_PER_CHANNEL_MS;
}
}
/**
* ChannelCollection that merges channels without knowing which channels are in each band. In
* order to do this if any band is added or the maxChannels is exceeded then all channels will
* be included.
*/
public class NoBandChannelCollection extends ChannelCollection {
private final ArraySet<Integer> mChannels = new ArraySet<Integer>();
private boolean mAllChannels = false;
@Override
public void addChannel(int frequency) {
mChannels.add(frequency);
}
@Override
public void addBand(int band) {
if (band != WifiScanner.WIFI_BAND_UNSPECIFIED) {
mAllChannels = true;
}
}
@Override
public boolean containsChannel(int channel) {
return mAllChannels || mChannels.contains(channel);
}
@Override
public boolean containsBand(int band) {
if (band != WifiScanner.WIFI_BAND_UNSPECIFIED) {
return mAllChannels;
}
return false;
}
@Override
public boolean partiallyContainsBand(int band) {
// We don't need to partially collapse settings in wificond scanner because we
// don't have any limitation on the number of channels that can be scanned. We also
// don't currently keep track of bands very well in NoBandChannelHelper.
return false;
}
@Override
public boolean isEmpty() {
return !mAllChannels && mChannels.isEmpty();
}
@Override
public boolean isAllChannels() {
return mAllChannels;
}
@Override
public void clear() {
mAllChannels = false;
mChannels.clear();
}
@Override
public Set<Integer> getMissingChannelsFromBand(int band) {
// We don't need to partially collapse settings in wificond scanner because we
// don't have any limitation on the number of channels that can be scanned. We also
// don't currently keep track of bands very well in NoBandChannelHelper.
return new ArraySet<Integer>();
}
@Override
public Set<Integer> getContainingChannelsFromBand(int band) {
// We don't need to partially collapse settings in wificond scanner because we
// don't have any limitation on the number of channels that can be scanned. We also
// don't currently keep track of bands very well in NoBandChannelHelper.
return new ArraySet<Integer>();
}
@Override
public Set<Integer> getChannelSet() {
if (!isEmpty() && !mAllChannels) {
return mChannels;
} else {
return new ArraySet<>();
}
}
@Override
public void fillBucketSettings(WifiNative.BucketSettings bucketSettings, int maxChannels) {
if (mAllChannels || mChannels.size() > maxChannels) {
bucketSettings.band = WifiScanner.WIFI_BAND_BOTH_WITH_DFS;
bucketSettings.num_channels = 0;
bucketSettings.channels = null;
} else {
bucketSettings.band = WifiScanner.WIFI_BAND_UNSPECIFIED;
bucketSettings.num_channels = mChannels.size();
bucketSettings.channels = new WifiNative.ChannelSettings[mChannels.size()];
for (int i = 0; i < mChannels.size(); ++i) {
WifiNative.ChannelSettings channelSettings = new WifiNative.ChannelSettings();
channelSettings.frequency = mChannels.valueAt(i);
bucketSettings.channels[i] = channelSettings;
}
}
}
@Override
public Set<Integer> getScanFreqs() {
if (mAllChannels) {
return null;
} else {
return new ArraySet<Integer>(mChannels);
}
}
}
@Override
public ChannelCollection createChannelCollection() {
return new NoBandChannelCollection();
}
}
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